Best Practice Guide Clutch 2015 SR

Clutch Hydraulics Tips DO NOT DEPRESS a CSC by hand prior to fitting. NEVER compress a CSC by hand to replicate the bearing movement. This can damage the internal seals as the cylinder has no hydraulic fluid present within the system. One of the most common reported faults after fitting a new CSC is leakage from the seals.

MAKE SURE that any clamping of hoses does not result in the collapse of the pipe – use the correct clamping tool (even better, try not to clamp the pipe at all).

ENSURE the area where the CSC is positioned is totally clean and debris free. Clean the mounting surface thoroughly, make sure the CSC is located squarely onto a clean gearbox case and ensure any rubber face seal or sealant is utilized in accordance with the manufacturer’s instructions.

ALWAYS replace the old contaminated fluid with NEW .

CHECK the CSC seats squarely and there is no damage to any component. Please check the internal threads/bolts for damage before fitment.

CAREFULLY FIT – Slide the CSC over the gearbox input shaft and slightly rotate to ensure the correct location on the gearbox case. Torque all the fixing bolts evenly using between 8-12Nm force, dependent upon manufacturers specifications. TAKE CARE with hydraulic connections. There are usually two types of connector, traditional screw-in & quick-clip types. With screw-in types, tighten to a torque of between 10-15Nm dependent upon manufacturers specifications. Quick-clip connectors are released by either pulling or pushing the retaining clip, dependent on the type. CHECK all CSC connection’s on the pipe before fitting to gearbox to ensure that the right size female end is being used. The wrong size will not seal and the gearbox will have to be removed in order to rectify the problem. BEFORE attempting to bleed (purge) the system, or before attempting to operate the clutch, ensure that the gearbox is fully located in the fitted position – tighten a few securing bolts to prevent any movement. This could avoid the unit being over stroked causing damage to the chamber seal. Bleed the system as per the manufacturer’s instructions or follow the steps below. MANUAL BLEEDING (using the clutch pedal) is not now recommended by clutch manufacturers as the pressure needed to depress the cover diaphragm spring fingers is now between 3000 and 7000 Kn. This amount of force is too excessive when trying to expel air from the system. Gravity or low pressure bleeding is the correct method. Any attempt to use high pressure will only compress air and not remove it. Pedals operate at about 10 kilos of pressure by foot, but internal CSC pressure can typically reach 40 bar (580psi). CHECK all pipe connections for old seals, debris etc that may inhibit the fluid return.

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